Ok too many males woman were not in front line combat and there were black French soldiers in the movie some said it was too white. I don't know how many blacks lived in England in WW 2 but whites made up most of the British army. There were woman on the paddle steamer bit they were civilians.

It was good, not fantastic. Spitfire scenes were great, my Dad would have loved to see them, as he joined the RAF (as an American volunteer) before the US entered the war. He then got in the Eagle Squadron 355 fighter group, when they transitioned to US Army Air Corps bases. Remember, no offical/separate air force then as we know it today.

Toughest aspect for some on that movie is called "Nolan Time", after the director. He weaves the "1-week" evacuation off the 'mole' and beaches, with a "1-day" journey of a small boat sailing from England to effect the rescue, with a "1-hour" flight time of a Spitfire over Dunkirk.

Damn that Spit Tom Hardy flew could fly a long time on just a tank full ...

303 machine guns were not big enough for a fighter not sure when they started putting 20 mm in the Spitfire.

Not sure why the Royal Navy did not have more heavy warships near Dunkirk I realize you can loose them but 300,000 is worrh loosing a battleship or 2, aircraft carriers could have helped too.British aircraft carriers could take damage becuase of the armored flight decks

1: Put a huge quantity of bullets out there & prey for enough connects to do damage.
2: Use really big rounds so you only need a very few hits.

The early spits & hurricanes had 8 or 12 browning that could fire 1200 rounds a minute, that's 9,600 or 14,400 rounds combined. each gun had 300 rounds.
The later ones starting with the Mk2B had the 2 X 20mms & 2 X .50 cal, cannon capacity was (IIRC 60 rounds though).
The later ones like the mk9 went all cannon with 4 20mm. they had 120 rounds per gun.
Its all a trade off of performance, weight, size & ammo capacity.